82 lines
2.0 KiB
Rust
82 lines
2.0 KiB
Rust
// aux-build:option_helpers.rs
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#![warn(clippy::map_unwrap_or)]
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#[macro_use]
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extern crate option_helpers;
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use std::collections::HashMap;
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#[rustfmt::skip]
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fn option_methods() {
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let opt = Some(1);
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// Check for `option.map(_).unwrap_or(_)` use.
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// Single line case.
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let _ = opt.map(|x| x + 1)
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// Should lint even though this call is on a separate line.
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.unwrap_or(0);
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// Multi-line cases.
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let _ = opt.map(|x| {
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x + 1
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}
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).unwrap_or(0);
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let _ = opt.map(|x| x + 1)
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.unwrap_or({
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0
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});
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// Single line `map(f).unwrap_or(None)` case.
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let _ = opt.map(|x| Some(x + 1)).unwrap_or(None);
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// Multi-line `map(f).unwrap_or(None)` cases.
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let _ = opt.map(|x| {
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Some(x + 1)
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}
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).unwrap_or(None);
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let _ = opt
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.map(|x| Some(x + 1))
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.unwrap_or(None);
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// macro case
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let _ = opt_map!(opt, |x| x + 1).unwrap_or(0); // should not lint
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// Should not lint if not copyable
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let id: String = "identifier".to_string();
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let _ = Some("prefix").map(|p| format!("{}.{}", p, id)).unwrap_or(id);
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// ...but DO lint if the `unwrap_or` argument is not used in the `map`
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let id: String = "identifier".to_string();
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let _ = Some("prefix").map(|p| format!("{}.", p)).unwrap_or(id);
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// Check for `option.map(_).unwrap_or_else(_)` use.
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// Multi-line cases.
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let _ = opt.map(|x| {
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x + 1
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}
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).unwrap_or_else(|| 0);
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let _ = opt.map(|x| x + 1)
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.unwrap_or_else(||
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0
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);
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}
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#[rustfmt::skip]
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fn result_methods() {
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let res: Result<i32, ()> = Ok(1);
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// Check for `result.map(_).unwrap_or_else(_)` use.
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// multi line cases
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let _ = res.map(|x| {
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x + 1
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}
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).unwrap_or_else(|_e| 0);
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let _ = res.map(|x| x + 1)
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.unwrap_or_else(|_e| {
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0
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});
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// macro case
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let _ = opt_map!(res, |x| x + 1).unwrap_or_else(|_e| 0); // should not lint
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}
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fn main() {
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option_methods();
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result_methods();
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}
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